Threading mechanism for automatic screw-machines.



No. 816,398. 4 PATBNT D MAR. 27, 1906.

0. M. SPENCER. v THREADING MECHANISM FOR AUTOMATIC SCREW MAGHINES".

AP'PLIOATION BILED MAE.2, 1905. I

a SHEETS-SHEET 1.

'%'zrzasvas: I [50 6 2502 did/ 72(9) PATENTE D MAR. 27, 1906,

C. M. SPENCER. THREADING MECHANISM FOR AUTOMATIC SCREW MACHINES.

APPLICATION FILED MAILZ, 1905.

3. SHEETSSHBET 2 'No.8 16,393.- PATBNTED MAR; 27; 1906..

' I 04M; SPENCER. IHREADING MECHANISM FOR AUTOMATIC SCREW MACHINES. APPLIOATIONI1LED MAR.Y2,' 1905.

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EEIEESH I IIIII carried .by a spindle UNITED STATES P NT OFFICE.

CHRISTOPHER M. SPENCER, OF WIND S OR, CONNECTICUT, ASSIGNOR TO THE UNIVERSAL .MACHINE SCREW COMPANY, OF' HARTFORD, CON- NECTICUT, A CORPORATION OF CONNECTICUT. THREADING- MECHANISM FOR. AUTOMATIC SCREW-MACHINES.

Specification of LettersPatent.

Patented- March 27, 1906.

To all whom it concern."

Be it known that I, CHRISTOPHER M. SPEN- GER, a citizen of the United States, residingat Windsor, in the county. of Hartford an State of Connecticut, have invented a new and useful Threading Mechanism for Auto matic Screw-Machines, of which the following is a specification.

This inventionrelates to an automatic multiple e spindle screw machine which is constructed to feeda continuous length of rod throu h each spindle and to turn down, form, threa and cut ofi a iece of each rod as itis' om tool to tool of the type illustrated and described inmy 1i- 0. 206,271.; The threading mechanism in machines of this. character must act positively, accurately,- andat the correct time; otherwise the tools will become broken orthe stock be imperfectly threaded. To' insure efiicient work easily and quickly, with but littIe fric-' .simple andsensitive threadin 4 the threadingigie.

view of the .collar.

tion, andto insure uniform results must be firmand-durable.

y The object of this invention isto provide a mechanism which will-work accurately, with but little friction, and will be very durable.

' Figure 1 of the accompanyingl I drawings. shows a side elevation of so muc of one of I q these automatic screw-machines as is necessary to illustrate the invention herem clalmed.

Fig. 2 shows a transverse section of the same looking toward theleft-hand side ofFig. 1. Fig. 3 shows, on much larger scale, a longitu dinal sectiondf the mechanism which causes the stockto be rotated in onedirection for turningit into thethreading-die. and rotated in the opposite direction for'turning it outof Fi 4 shows a face view of a clutch-s ingqy'o e. Fig. '5 shows-an edge view of this voke. Fig. 6 shows a face view ofthe collar. whichsupportsthe inner ends of the-yokes, and Fig. 7ShOWS an edge The tubular s indles 1 are supported b a cylindrical spindle-head"2,- mounted so t at I it maybe rotated ina'n annular frame 3. The

head, "with the spindles, is rotated atintervals from position to position by means'of the by the frame;

is swung in one direction by a cam 6 and in the opposite direction by a cam 7 on theface of the cam-disk 8. A spring 9 tends to hold the end of the finger in one of the notch it occupies.

The head is locked in adapted to project into the mortises 13in the osition whilethe toolsareoperating by a olt-12, sup orted.

The inner end of the olt is periphery of the head. The outer endof the olt is engaged by thelever 14, that is oscillated for withdrawin the bolt from a mortise by a cam;l5 on t e face of the cam-disk and oscillated for thrus'ting the bolt into a mortise by a, spring 1'6.

Loose on a sleeve 17 on each spindle are a if ear 18 and a gear 19. On the central tubuoperation, the threading mechanism shouldar shaft '20, that is provided with a drivingpulley 2.1 is agear 22, that'meshes with all of the loose. spin e-gears 18. On a .solid shaft 23, that extends through the central tubular shaft and is provided with a drivin -pulley 24, is a gear 25, that Inesheswitha of the loose spindle-gears 19. The pulleys 'are belted so that one'will runin onedirection andthe other in-the opposite direction.

' Between the gears 18 and 19, that are loose ,on the sleeve 17, which is keyed to the spin- I (He, is a clutch-collar 26. One end of the clutchrcollar, which is movable along but rotates-with the sleeve, is tapered and is forced into the tapering recess -of the'gear 18 by Springs 27. On the other end of the clutch- I collar is a block 28, that is adapted to engage with the end of a pin 29, rojecting from the gear 19. -When the clutc isin its normal po-' sition, the spindle isrotated at high s eedfor wardly'by the, pulley 21 through the gear 18. When the clutch is moved against the springs, so that the block '28engages the pin 29, the'g ear 18 is released, and the gearl9 is connected withthe spindle, and. then the spindle is rotated in.theioppositedirection at 'a slow'er speed by "means of the pulley 24. Encirchng each clutch-'collaris a yoke 30. Theinner end of each oke extends into a recess 31 in a collar 32, t at is loosely mounted' onthe .centraltubular shaft20 between the gears 22 and 25. The outer end-of each yoke projects to such an extent that as the spindlehead rotates it extends into the plane of the path of the upper end of a lever 33. This lever is adapted to be oscillated at the proper time by means of the cam 84 on the cam-cylinder 35. When this lever is oscillated by the cam, it engagesthe-outer end of a yoke and forces a clutch-collarback, so as to release a gear 18 and connect a gear 19 for the purpose of reversing the rotation of the spindie. This reverse movement takes place just before the die is moved up for the purpose of threading the stock, so that the stock will be threaded by the reverse rotation of the spin dlel After the thread has been cut the cam releases the lever 33 and the yoke 30, so that the springs may throw the clutch out of en gagement with the gear 19 into engagement with the gear 18 in order that the spindle may be again rotated forwardly and the stock unscrewed from the die which has cut the thread.

By means of this construction the spindle which carries the stock is rotated forwardly at a rapid speedall of the time during its revolution with the head, except when the cam on the cam-cylinder oscillates the lever 33 and causes the yoke 30 to disengage the clutch from the gear 18 and.v engage the gear 19. Then the spindle is rotated backwardly at a slower speed. The gears are always in mesh and are positively connected with the spindle at the proper time. The yokes which cause the shifting of the clutches have and meshing with one gear on each spindle, a'

tubular driving-shaft on the central shaft, a gear mounted on the tubular shaft and meshing with the other gear on each spindle, a clutch on each spindle for connecting either of the gears with its spindle, a yoke encircling each clutch, a lever for moving the i v Biases yokes, and a cam for oscillating the lever, substantially as specified.

2. In a screw-machine a plural number. of I revoluble tubular spindles, two gears'loosely mounted'upon each spindle, a central-drivingeshaft, a gear mounted on the central shaft and meshing with one gear on eachspindle, a tubular driving-shaft on the central shaft, a gear mounted on the tubular shaft and meshing with the other car on each spindle, a clutch on each spin lefor connecting either 'of the gears with its spindles, a yoke encircling eachclutch and a collar on the central shaft holding the inner ends of the yokes, substantially as'specii ied.

3. In a screw-machine aplural number of revoluble tubular spindles, two gears loosely mounted upon each spindle, acentral driving-shaft, agear mounted on the central shaft and meshing with one gear on each spindle, a tubular driving-shaft on the'central shaft, a

gear mounted on the tubular shaft and meshing with the, other gear on eachspindle, a clutch on each spindle for connecting either of the gears with its spindle,- a yoke encircling each clutch, a collar on the central shaft holding the inner ends of the yokes, a lever adapted to engage the outer ends of theyokes,

and a cam for oscillating the lever, substan- .tially as specified.

4. In a screw-machine a plural number of revoluble tubular spindles, two gears loosely mounted upon each spindle, a clutch keyed toea-ch spindle between the gears, springs adapted to thrust the clutchesin-one direction, a central driving-shaft,' a gear mounted on the central shaft and meshing with one 'gear on each spindle, a' tubular driving-shaft on the central shaft, a gear mounted on the tubular shaft and meshingwith the other gear on each spindle, a yoke encircling each clutch, a collar mounted on the driving-shaft and having mortises'receiving the inner ends of the yokes, a lever adapted'to engage the outer end of each yoke and force it and the clutch against the thrust of the-springs and a cam for oscillating the lever, substantially as too specified. I

CHRISTOPHER M; srENcEn; Witnesses I HARRY RHWILLIAMS, ETHEL M. Lows.- 

